3. Results
3.1. Yield advantage of intercropping
Grain yield differed among treatments (P < 0.001, F = 120.38,
d.f. = 3) and experiments (P < 0.0281, F = 5.18, d.f. = 1), and it was
higher in Exp. 1 than in Exp. 2. Sunflower grain yield in intercrops
did not differ from that in sole crops. However, soybean yield was
significantly lower in intercrops (P < 0.01). LER value was greater
than 1 in both experiments (Table 2), which suggests an overall
yield advantage of intercrops relative to sole crops.
3.2. Effects on weed assemblages
A total of 39 and 14 weed species were surveyed in Exp. 1 and
Exp. 2, respectively (Tables A1 and A2). Floristic composition of
weed assemblages differed between sole crops and intercrops in
both experiments (Exp. 1: P = 0.0004; Exp. 2: P = 0.01). In Exp. 1,
composition of weed assemblages in soybean sole crops significantly
differed from that in sunflower sole crops (P = 0.01) and
intercrops (P = 0.002), and the composition in sunflower sole crops
3. Results3.1. Yield advantage of intercroppingGrain yield differed among treatments (P < 0.001, F = 120.38,d.f. = 3) and experiments (P < 0.0281, F = 5.18, d.f. = 1), and it washigher in Exp. 1 than in Exp. 2. Sunflower grain yield in intercropsdid not differ from that in sole crops. However, soybean yield wassignificantly lower in intercrops (P < 0.01). LER value was greaterthan 1 in both experiments (Table 2), which suggests an overallyield advantage of intercrops relative to sole crops.3.2. Effects on weed assemblagesA total of 39 and 14 weed species were surveyed in Exp. 1 andExp. 2, respectively (Tables A1 and A2). Floristic composition ofweed assemblages differed between sole crops and intercrops inboth experiments (Exp. 1: P = 0.0004; Exp. 2: P = 0.01). In Exp. 1,composition of weed assemblages in soybean sole crops significantlydiffered from that in sunflower sole crops (P = 0.01) andintercrops (P = 0.002), and the composition in sunflower sole crops
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